Setting Up 6 Flight Modes Using Flap and Elev D/R Switches For The Spektrum DX7s Radio

For those of you who have been attempting to get 6 flight modes out of your Spektrum radio, I have finally figured a method to make it work with the "Flap" and "Elev D/R" toggle switches. I won't bore you with details but attached are my instructions to reconfigure your radio (mine is a DX7s) to allow only one channel to be used to toggle up to 6 modes. I prefer to keep Channel 7 available for other things.

These are the values (PWM) I came up with

Elev D/R – 0                 Flap – 0                      Mission Planner – Flight Mode 6                PWM - 1932
                                                  1                                                                            3                              1395
                                                  2                                                                            1                              1136

Elev D/R – 1                 Flap – 0                      Mission Planner – Flight Mode 5                PWM - 1715
                                                  1                                                                            4                              1530
                                                  2                                                                            2                              1299


Doug W.

Views: 1980

Comment by Scott Penrose on May 18, 2014 at 3:46am

Great docs, just checking if this is different to the existing methods:

Seems you are getting it with Flap and Elev D/R, while the one I use is the Flap and Gear switch. I wonder if there is an advantage of one over the other, At least the Elev D/R switch is near the flaps.

My Channel 7 is Mix/Hold - but I am unable to get more than 50% (0-50% or swapped, 50-100%) - which is ok but had some issues with getting it to work on my Pixhawk, I don't think that switches use the radio calibration.

Comment by Doug Walmsley on May 18, 2014 at 8:19am

Hi Scott,

This article is different in that I wanted to not use my "Gear" toggle which is Channel 7 for mixing with my "Flap" toggle to achieve 6 flight modes (actually 5).  So this post is to provide those another option of using two co-located switches to achieve 6 flight modes on one channel (channel 5).

Comment by Doug Walmsley on May 18, 2014 at 6:37pm

For anyones interest, I ran 4 flights today and used all 6 modes with no ill affects. Very pleased with setup.

Comment by Johann van de Venter on May 20, 2014 at 12:19pm

Will this work on the DX8 as well?

Comment by Doug Walmsley on May 21, 2014 at 8:03am

I do not own one, but I'd say yes.  Recommend you backup your radio parameters for the wing you are flying then make the changes and test fly it.  If it doesn't configure and work for you, you can import you saved parameters over top the latest one and be back to what you have.  Please let me know if it works for you.

Comment by Stephen Zidek on May 21, 2014 at 8:21am

Oh nice, I've been mixing gear with flap for years to get 6 positions.  I've been running the knob on channel 6/7.  This is nicer, one more channel.

Comment by MikeRover on June 11, 2014 at 5:32pm

Is there any useful documentation anywhere on what all the Spektrum parameters mean?  This is cool, and I'll be implementing it, but I'd also like to play some more with driving spare Rover channels (elevator and aileron) with the D/R switches. 


I got it setup last night so I can have elevator switch from -100% to +100% via the mix switch, and aileron from -100% to 0%, but that was more trial and error than anything else. The Spektrum manual is very basic.  Is there a "mix, trim and switch" tutorial somewhere?  How did you nut all this out?

Comment by Doug Walmsley on June 21, 2014 at 7:46pm

MikeRover, I ran into the same snag with lack of supporting documentation on the Spektrum radio.  What I did do was review what other folks used to set up their settings and then a lot of trial and error.  I did connect my drone to the Mission Planner softer and as I adjusted mixing and trim settings, observe the affect on the Flight Mode menu.  Once tweaked, I then performed flight control checks then low altitude flight testing to ensure I had no crazy affects when switching modes.  Sorry that I am not able to help too much.  Good Luck. 

Comment by MikeRover on June 23, 2014 at 4:29pm

I had a crack and got to here:

I did exactly what you did - reviewed what other folks (namely you) used to setup their settings, then a lot of trial and error!!!

Comment by Warren Medernach on August 9, 2014 at 5:34pm

Hi Doug, this is fantastic as I'm trying to get my ch7 back for camera triggering...

Fyi, my previous setup was using the Gear and Flap to get the 6 modes..

I've followed your instructions, and I can see the values change appropriately in the Radio Calibration tab in MP.  Albeit, my values are on average ~20 below yours.  Regardless, they are still in the correct range.  The problem is it's not changing the Flight Modes.  I'm sure part of the problem is that my Gear switch is still 'active' somehow and the FM changes between FM 1 & 6 when it's toggled.  I'm sure I've reset all of the servo and mixing settings for the previous configuration, so I'm kind of at a loss what else to check...

Any suggestions or tips would be greatly appreciated.

Warren M


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